Predicting osteomyelitis in patients whose initial MRI demonstrated bone marrow edema without corresponding T1 signal...

Area of Science:

• Radiology
• Orthopedics
• Diabetology

Background:

• Diabetic foot ulcers are a common complication of diabetes mellitus.
• Osteomyelitis is a serious infection that can lead to amputation.
• Accurate risk stratification for osteomyelitis in diabetic ulcers is crucial for timely intervention.

Purpose of the Study:

• To identify MRI-derived characteristics of diabetic ulcers that predict the development of osteomyelitis.
• To improve early detection and management of osteomyelitis in diabetic patients.

Main Methods:

• Retrospective analysis of 60 pedal ulcers with suspected osteomyelitis using MRI.
• Measurement of ulcer dimensions and depth.
• Calculation of marrow ROI/joint fluid ratios on T2/STIR sequences.
• Statistical analysis using t-tests and Cox proportional hazard models.

Main Results:

• Thirty-four of 60 ulcers progressed to osteomyelitis.
• Higher marrow ROI/joint fluid ratios (>53%) significantly increased osteomyelitis risk (6.5-fold).
• Ulcer proximity to bone (6 mm vs 9 mm) and larger ulcer size (>3 cm²) were also associated with increased risk, though less strongly.

Conclusions:

• Elevated bone marrow signal intensity relative to joint fluid on T2/STIR MRI sequences is the strongest predictor of osteomyelitis in diabetic foot ulcers.
• Ulcer size and depth are less reliable indicators of osteomyelitis risk compared to MRI signal ratios.